SAMOILENKO, V. G. Quasiinvariant deformations of invariant submanifolds of Hamiltonian dynamical systems. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 46, n. 8, p. 1043–1054, 1994. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5657. Acesso em: 5 dec. 2025.